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<pre>
<!--request.getParameter("a")=<%= request.getParameter("a")%>
${param.a}=${param.a}
${param["a.b"]}


${paramValues.b[0]}
//EL表达式不能访问对象的成员变量，但是能访问方法和属性（get）
${param.a.length()}
>gt >=ge < lt <= le == eq  !=nq 
${2 gt 1 }  ${"aaa">"bb" }
-->
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